3&comma;Advantages of this water heater systerm&colon;&ast;Cancel the connecting copper pipes and coil pipes in water tank&comma; avoiding problems like leakage&comma; corrosion and incrustation&period;&ast;Highly-efficient heat exchanger and screened circulating pump in main unit&period;&ast;Easy installation&period; The distance between main unit and water tank could be set up according to real needs&period;&ast;High-tech water tank supplying sufficient water pressure&period; Auto-balancing the pressure between hot and cold water&period;&ast;Intellectual control and auto-operation&ast;Multiple protection systems&period;&ast;Capable of working with solar water heater&comma; saving more energy&period;